About this app

EPub2M4B is a macOS app that converts EPUB ebooks into M4B audiobooks using the Kokoro-82M AI text-to-speech model — running entirely on your Mac with Apple Silicon. No cloud services, no internet required for conversion. EPub2M4B includes the complete Kokoro-82M neural voice model directly in the app — no downloads, no cloud dependency. This ensures your books are converted with studio-quality voices entirely on your device, with zero internet required after installation. **How it works:** 1. Open an EPUB file — drag and drop or browse with the file picker 2. Choose a voice from 54 built-in AI voices across 10 languages 3. Click "Start Conversion" — the on-device AI model reads your book aloud 4. Your finished M4B audiobook is ready with automatic chapter markers **Supported Languages & Voices:** • English (American) — 12 voices • English (British) — 8 voices • Japanese — 8 voices • Chinese — 2 voices • Korean — 2 voices • French — 2 voices • Italian — 2 voices • Portuguese (Brazilian) — 2 voices • Spanish — 2 voices • Hindi — 2 voices **Key Features:** • AI-powered text-to-speech using the Kokoro-82M model • 54 built-in voices — male, female, and character voices • Adjustable speech speed from 0.5x to 1.5x (default 1.0x) • Automatic chapter detection and M4B chapter markers • Drag-and-drop EPUB file import • Real-time conversion progress with chapter-by-chapter status • M4B output with AAC encoding — compatible with Apple Books, VLC, and all major audiobook players • Beautiful Material Design 3 interface with dark mode support • Fully localized in English and Chinese **Why Buy EPub2M4B?** Unlike cloud-based AI voice services that charge $20–50/month in subscription fees or per-character token costs, EPub2M4B is a one-time purchase of $13.99 — convert unlimited books forever with no recurring fees. Your text never leaves your Mac. No uploads, no cloud processing, no data collection. Most text-to-speech tools require sending your books to remote servers; EPub2M4B runs the AI model entirely on your device — your books and audiobooks stay completely private. **7-Day Free Trial:** Try EPub2M4B with full functionality for 7 days. After the trial, unlock unlimited conversions with a one-time purchase — no subscriptions, no recurring fees. **100% Private:** EPub2M4B processes all text-to-speech conversion entirely on your Mac using Apple Silicon. No book content, audio output, or usage patterns are ever sent to external servers. **Disclaimer:** EPub2M4B uses AI-generated speech synthesis. Audio quality may vary depending on source text formatting, language, and selected voice. Results are for personal use.

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